Cita APA (7a ed.)

Keeton, W. T. (1972). Elements of biological science (2nd ed.). W.W. Norton.

Cita Chicago Style (17a ed.)

Keeton, William T. Elements of Biological Science. 2nd ed. New York: W.W. Norton, 1972.

Cita MLA (9a ed.)

Keeton, William T. Elements of Biological Science. 2nd ed. W.W. Norton, 1972.